It was OK if you were a Met fan at Citi Field yesterday or watching the Futures Game on TV to close your eyes and imagine this equation: Matt Harvey and Zack Wheeler plus Noah Syndergaard and Rafael Montero equals ...

Well, yes, that blank still needs to be filled in. But know this — Syndergaard for the U.S. team and Montero for the World squad — might have received the starts because of the game being at Citi Field. But as one NL assistant general manager said: “The industry thinks very highly of those guys.”

An NL pro scouting director in attendance added: “They are two first-tier prospects. Both are legitimate starting prospects and both profile to hold down regular rotation spots on a contending-level club.”

Syndergaard was viewed as the second-most important piece behind Travis d’Arnaud in the trade with Toronto for R.A. Dickey. But it is possible no pitching prospect has had his reputation grow more this year than the righty. There are many elements that impress scouts, but what stands out to the group with whom I spoke is that young, tall pitchers usually battle their mechanics and, thus, struggle with precision.

But Syndergaard, who is 6-foot-6 and does not turn 21 until Aug. 29, has above-average command. This year, for example, between Single- and Double-A, he has whiffed 90 and walked just 20 in 83 2/3 innings.

In the top of the first yesterday, Syndergaard worked at 94-96 mph, mixing in a good, but still developing, curve. He allowed a single to Red Sox shortstop prospect Xander Bogaerts, struck out one and got the benefit of having a runner thrown out stealing.

A scout in attendance called Syndergaard “an impact starter who will be above Wheeler and below Harvey.” Asked independently two different executives who watched the Futures Game said they thought Syndergaard was the best pitcher of the 19 who played.